Web/JS-focused newsletter. Usually has really great content. No spam either, I always sign up for this on new email accounts.
There is a ton of stuff in here, pick something from the left sidebar that you don't know about and check it out. There's interesting stuff on PWAs, performance, security, etc..
Also if you go to the updates tab and select "BY YEAR". You will find the developers web blog which just has a ton of articles. A lot of it is about brand new Web APIs in coming to Chrome.